QUEEN CHARLOTTE ISLANDS. 59 B 



westward, and was not further seen. The rocks are best displayed on 



the north side of Logan Inlet. Near the base of Eed Top Mountain, 



on the north side of Crescent Inlet, flaggy argillites appear, much 



broken and traversed by dykes, but with general low north-easterly 



dips. They run south-eastward, through low ground, behind the 



felspathic rocks of White Point, and come out on the shore of Logan 



Inlet near its west end. These argillites probably represent those 



frequently before mentioned. They are found on the opposite side of 



Crescent Inlet, ajyparently forming the other slope of an anticlinal, 



which is no doubt the continuation northward of that already mentioned 



in Darwin Sound. A few fossils (mentioned on p. 58 B.) were obtained Fossiiiferous 



from them here, and they were also found to be fossiliferous in the ar 



small island near the entrance to Echo Harbour, where Monotis subcir- 



cularis was recognised. The width of the north shore of Logan Inlet 



occupied by the argillite band is a mile and a half or more, but the 



shore is rather low, and the section is not continuous. The argillites 



are then overlain in apparent conformity by flaggy grey sandstones, 



chiefly felspathic in composition. These are followed in turn by coarse Felspathic 



conglomerates with well rounded fragments, which appear to be chiefly 



or entirely of crystalline rocks, unlike those of this part of the series. 



If no faults not recognized affect the strata, the conglomerate must 



have a thickness of several hundred feet at least. To the conglomerates Conglomerates. 



follow the great overlying series of agglomerate and ash rocks, the 



distribution of which has been outlined above. These occupy the 



shore of Logan Inlet for about five miles eastward, but are cut off near 



the outer point by a mass of coarse grey granitoid diorite with epidote. 



The agglomerates are occasionally coarse, but usually fine-drained, and Agglomerates 



j 7 • , t , , . , . . '. and ash rocks. 



graduate into ash rocks, which again pass into a compact material 

 which may be called a felsite, and may in some cases represent former 

 flows of molten matter. The rocks are not highly crystalline, but 

 generally dull and fine-grained on fracture, and pale in colour. The 

 prevalent tints are greys and light grey-greens, and these characterize 

 equally the fragments and matrix of the agglomerates, between which 

 there is frequently very little lithological diversity. The beds are 

 everywhere considerably disturbed, but the north side of Logan Inlet 

 would probably be the best locality in which to make a measured 

 section of the strata, The total thickness of the volcanic series over- Thickness. 

 lying the argillites and conglomerates can scarcely, however, be less 

 than 5000 or 6000 feet. 



The greater part of the rocks of Eamsay, Murchison, Faraday and 

 the Tar Islands are supposed to belong to this overlying volcanic 

 series. Well bedded and fine-grained pale felspathic sandstones, prob- 

 ably representing those immediately overlying the argillites at the 



